Epithelium Flashcards
(46 cards)
How are cells in glandular epithelium specialised?
They produce a secretion
Where does the secretion of glandular cells go to?
They secrete to a duct or to nearby blood vessels
Where in the body is the renewal of epithelium fast?
In intestinal cells as they are renewed every week
Where in the body is the renewal of epithelium slow?
In liver or pancreas
Where is the thyroid gland and what does it control?
In the throat
Controls metabolism
What are the names of the 2 epithelial-like connective tissues?
Endothelium
Mesothelium
What do endothelium and mesothelium tissues line?
Endothelium - cardiovascular system
Mesothelium - internal closed cavities e.g. thoracic and abdominal cavities
What is the band of covering epithelium supported by?
Basal lamina
What do the transmembrane proteins provide?
Very close adhering properties to the cells
What fibres are present in CT?
Collagen fibres
What are cells that are closely apposed referred to as?
Contiguous
What is the name at the top of the cell?
Apical region
What is the name of the bottom of the cell?
Basale region
How does the epithelia receive its nutrients?
From diffusion of substances from vascular beds that are located within the CT
What are the 3 morphological characteristics of epithelia?
- Number of cell layers
- Shape of cell
- Surface specialisations
What are the 3 surface specialisation?
- Cilia
- Microvilli
- Keratin
What is the role of simple squamous epithelium?
Facilitate passive diffusion of gases or fluid e.g. lungs and kidney
What is the role of simple cuboidal cells?
Lines small ducts and tubules - may have excretory, secretory or absorptive functions
What are simple columnar cells associated with?
Absorption and secretion e.g. GI tract
What is the surface specialisation of the intestine?
Microvilli
Where is pseudostratified columnar ciliated epithelium found?
In respiratory epithelium; trachea and bronchus
What does cilia do?
It beats in a uniform direction and moves mucus and trapped particle back up the the mouth
What is stratified squamous keratinising epithelium adapted for?
To withstand constant abrasion
Where is stratified squamous non-keratinising epithelium found?
Oral cavity
Oesophagus
Vagina
